Learn

Saturday, 31 October

JEE Main 2021 · PhysicsMultiple choiceSingle correctHardMulti-step

JEE Main 22 July 2021, Shift 2, Physics Q8

Question 8 of 90 in this shift, Physics question 8 of 30, Section A.

An electric dipole is placed on xx-axis in proximity to a line charge of linear charge density 3.0×10−63.0\times10^{-6} C/m. Line charge is placed on zz-axis and positive and negative charge of dipole is at a distance of 10 mm and 12 mm from the origin respectively. If total force of 4 N is exerted on the dipole, find out the amount of positive or negative charge of the dipole.
  1. (1)815.1815.1 nC
  2. (2)0.4850.485 mC
  3. (3)8.8 μ8.8\ \muC
  4. (4)4.44 μ4.44\ \muCOfficial answer

Official answer

Option 4

NTA final key.

Chapter
Electric Charges and Fields
Topic
Electric Dipoles
Idea tested
Dipole Force in a Radial Field

Same topic in other shifts

All Electric Dipoles questions
  1. 2 Apr 2026, Shift 1 · Q36Two short electric dipoles AA and BB having dipole moment p1p_1 and p2p_2 respectively are placed with their axis mutually perpendicular…MediumSingle correctHas a figure
  2. 4 Apr 2026, Shift 2 · Q36A rigid dipole undergoes a simple harmonic motion about its centre in the presence of an electric field E⃗1=E0 x^\vec E_1=E_0\,\hat x. If another…MediumSingle correct
  3. 7 Apr 2025, Shift 2 · Q37A dipole with two electric charges of 2 μ2\ \muC magnitude each, with separation distance 0.5 μ0.5\ \mum, is placed between the plates of a…MediumSingle correct
  4. 5 Apr 2024, Shift 2 · Q58The electric field at point p due to an electric dipole is E. The electric field at point R on equatorial line will be Ex\frac{E}{x}. The…MediumNumerical valueHas a figure
  5. 30 Jan 2024, Shift 1 · Q40The electrostatic potential due to an electric dipole at a distance 'r' varies as :EasySingle correct
  6. 6 Apr 2023, Shift 2 · Q50A dipole comprises of two charged particles of identical magnitude q and opposite in nature. The mass 'm' of the positive charged particle…HardSingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.